The field capabilities API returns the information about the capabilities of fields among multiple indices Added in 5.4.0

GET /_field_caps

The field capabilities API returns runtime fields like any other field. For example, a runtime field with a type of keyword is returned as any other field that belongs to the keyword family.

Query parameters

  • allow_no_indices boolean

    If false, the request returns an error if any wildcard expression, index alias, or _all value targets only missing or closed indices. This behavior applies even if the request targets other open indices. For example, a request targeting foo*,bar* returns an error if an index starts with foo but no index starts with bar.

  • expand_wildcards string | array[string]

    Type of index that wildcard patterns can match. If the request can target data streams, this argument determines whether wildcard expressions match hidden data streams. Supports comma-separated values, such as open,hidden.

  • fields string | array[string]

    Comma-separated list of fields to retrieve capabilities for. Wildcard (*) expressions are supported.

  • ignore_unavailable boolean

    If true, missing or closed indices are not included in the response.

  • include_unmapped boolean

    If true, unmapped fields are included in the response.

  • filters string

    An optional set of filters: can include +metadata,-metadata,-nested,-multifield,-parent

  • types array[string]

    Only return results for fields that have one of the types in the list

  • include_empty_fields boolean

    If false, empty fields are not included in the response.

application/json

Body

  • fields string | array[string]
  • index_filter object

    Additional properties are allowed.

    External documentation
  • runtime_mappings object
    Hide runtime_mappings attribute Show runtime_mappings attribute object
    • * object Additional properties

      Additional properties are allowed.

      Hide * attributes Show * attributes object
      • fields object

        For type composite

        Hide fields attribute Show fields attribute object
        • * object Additional properties

          Additional properties are allowed.

          Hide * attribute Show * attribute object
          • type string Required

            Values are boolean, composite, date, double, geo_point, ip, keyword, long, or lookup.

      • fetch_fields array[object]

        For type lookup

        Hide fetch_fields attributes Show fetch_fields attributes object
        • field string Required

          Path to field or array of paths. Some API's support wildcards in the path to select multiple fields.

        • format string
      • format string

        A custom format for date type runtime fields.

      • input_field string

        Path to field or array of paths. Some API's support wildcards in the path to select multiple fields.

      • target_field string

        Path to field or array of paths. Some API's support wildcards in the path to select multiple fields.

      • target_index string
      • script object

        Additional properties are allowed.

        Hide script attributes Show script attributes object
        • source string

          The script source.

        • id string
        • params object

          Specifies any named parameters that are passed into the script as variables. Use parameters instead of hard-coded values to decrease compile time.

          Hide params attribute Show params attribute object
          • * object Additional properties

            Additional properties are allowed.

        • lang string

          Any of:
          _types:ScriptLanguage string _types:ScriptLanguage string

          Values are painless, expression, mustache, or java.

        • options object
          Hide options attribute Show options attribute object
          • * string Additional properties
      • type string Required

        Values are boolean, composite, date, double, geo_point, ip, keyword, long, or lookup.

Responses

  • 200 application/json
    Hide response attributes Show response attributes object
    • indices string | array[string] Required
    • fields object Required
      Hide fields attribute Show fields attribute object
      • * object Additional properties
        Hide * attribute Show * attribute object
        • * object Additional properties

          Additional properties are allowed.

          Hide * attributes Show * attributes object
          • aggregatable boolean Required

            Whether this field can be aggregated on all indices.

          • indices string | array[string]
          • meta object
            Hide meta attribute Show meta attribute object
            • * object Additional properties

              Additional properties are allowed.

          • non_aggregatable_indices string | array[string]
          • non_searchable_indices string | array[string]
          • searchable boolean Required

            Whether this field is indexed for search on all indices.

          • type string Required
          • metadata_field boolean

            Whether this field is registered as a metadata field.

          • time_series_dimension boolean Technical preview

            Whether this field is used as a time series dimension.

          • time_series_metric string

            Values are gauge, counter, summary, histogram, or position.

          • non_dimension_indices array[string] Technical preview

            If this list is present in response then some indices have the field marked as a dimension and other indices, the ones in this list, do not.

          • metric_conflicts_indices array[string] Technical preview

            The list of indices where this field is present if these indices don’t have the same time_series_metric value for this field.
GET /_field_caps 
curl \
 -X GET http://api.example.com/_field_caps \
 -H "Content-Type: application/json" \
 -d '{"fields":"string","index_filter":{},"runtime_mappings":{"additionalProperty1":{"fields":{"additionalProperty1":{"type":"boolean"},"additionalProperty2":{"type":"boolean"}},"fetch_fields":[{"field":"string","format":"string"}],"format":"string","input_field":"string","target_field":"string","target_index":"string","script":{"source":"string","id":"string","params":{"additionalProperty1":{},"additionalProperty2":{}},"":"painless","options":{"additionalProperty1":"string","additionalProperty2":"string"}},"type":"boolean"},"additionalProperty2":{"fields":{"additionalProperty1":{"type":"boolean"},"additionalProperty2":{"type":"boolean"}},"fetch_fields":[{"field":"string","format":"string"}],"format":"string","input_field":"string","target_field":"string","target_index":"string","script":{"source":"string","id":"string","params":{"additionalProperty1":{},"additionalProperty2":{}},"":"painless","options":{"additionalProperty1":"string","additionalProperty2":"string"}},"type":"boolean"}}}'
Request examples 
{
  "fields": "string",
  "index_filter": {},
  "runtime_mappings": {
    "additionalProperty1": {
      "fields": {
        "additionalProperty1": {
          "type": "boolean"
        },
        "additionalProperty2": {
          "type": "boolean"
        }
      },
      "fetch_fields": [
        {
          "field": "string",
          "format": "string"
        }
      ],
      "format": "string",
      "input_field": "string",
      "target_field": "string",
      "target_index": "string",
      "script": {
        "source": "string",
        "id": "string",
        "params": {
          "additionalProperty1": {},
          "additionalProperty2": {}
        },
        "": "painless",
        "options": {
          "additionalProperty1": "string",
          "additionalProperty2": "string"
        }
      },
      "type": "boolean"
    },
    "additionalProperty2": {
      "fields": {
        "additionalProperty1": {
          "type": "boolean"
        },
        "additionalProperty2": {
          "type": "boolean"
        }
      },
      "fetch_fields": [
        {
          "field": "string",
          "format": "string"
        }
      ],
      "format": "string",
      "input_field": "string",
      "target_field": "string",
      "target_index": "string",
      "script": {
        "source": "string",
        "id": "string",
        "params": {
          "additionalProperty1": {},
          "additionalProperty2": {}
        },
        "": "painless",
        "options": {
          "additionalProperty1": "string",
          "additionalProperty2": "string"
        }
      },
      "type": "boolean"
    }
  }
}
Response examples (200) 
{
  "indices": "string",
  "fields": {
    "additionalProperty1": {
      "additionalProperty1": {
        "aggregatable": true,
        "indices": "string",
        "meta": {
          "additionalProperty1": {},
          "additionalProperty2": {}
        },
        "non_aggregatable_indices": "string",
        "non_searchable_indices": "string",
        "searchable": true,
        "type": "string",
        "metadata_field": true,
        "time_series_dimension": true,
        "time_series_metric": "gauge",
        "non_dimension_indices": [
          "string"
        ],
        "metric_conflicts_indices": [
          "string"
        ]
      },
      "additionalProperty2": {
        "aggregatable": true,
        "indices": "string",
        "meta": {
          "additionalProperty1": {},
          "additionalProperty2": {}
        },
        "non_aggregatable_indices": "string",
        "non_searchable_indices": "string",
        "searchable": true,
        "type": "string",
        "metadata_field": true,
        "time_series_dimension": true,
        "time_series_metric": "gauge",
        "non_dimension_indices": [
          "string"
        ],
        "metric_conflicts_indices": [
          "string"
        ]
      }
    },
    "additionalProperty2": {
      "additionalProperty1": {
        "aggregatable": true,
        "indices": "string",
        "meta": {
          "additionalProperty1": {},
          "additionalProperty2": {}
        },
        "non_aggregatable_indices": "string",
        "non_searchable_indices": "string",
        "searchable": true,
        "type": "string",
        "metadata_field": true,
        "time_series_dimension": true,
        "time_series_metric": "gauge",
        "non_dimension_indices": [
          "string"
        ],
        "metric_conflicts_indices": [
          "string"
        ]
      },
      "additionalProperty2": {
        "aggregatable": true,
        "indices": "string",
        "meta": {
          "additionalProperty1": {},
          "additionalProperty2": {}
        },
        "non_aggregatable_indices": "string",
        "non_searchable_indices": "string",
        "searchable": true,
        "type": "string",
        "metadata_field": true,
        "time_series_dimension": true,
        "time_series_metric": "gauge",
        "non_dimension_indices": [
          "string"
        ],
        "metric_conflicts_indices": [
          "string"
        ]
      }
    }
  }
}